Well, LimeSurvey uses CKEditor but, in my opinion, that is bloated and a pain to set up.
The easiest solution would be to use the CDN version of TinyMCE -
www.tinymce.com/index.php
.
So, simply adding something like this to
startpage.pstpl after the {TEMPLATEJS} tag should do the trick.
Code:
<script src="//tinymce.cachefly.net/4.0/tinymce.min.js"></script>
<script>
tinymce.init({
plugins: 'link, code',
menubar : false,
toolbar1: 'undo redo | formatselect fontselect fontsizeselect | link | code',
toolbar2: 'bold italic underline | alignleft aligncenter alignright alignjustify | bullist numlist | outdent indent blockquote',
selector:'textarea'
});
</script>
.